Salute!
So sad, but gotta find out why and not let it happen again if possible.
Gotta tellya that back in 'nam the grunts scared the hell outta my trash-hauler buddies. They would crawl on a 123 or 'bou with C4 bars and grenades and mucho 7.72 or 5.56 in their ditty bags. So we should not rule out unintended ordnance explosions or related. Ditto for raft deployments and other gear.
The lack of severe wx is disturbing, although the Herc is a tough bird and is used to penetrate hurricanes on a regular basis.
Ditto for CFIT, as it looks like the main fuselage hit inverted.
Gums sends...